Very Cool, Very Vaporous 1-Handed Keyboard
beckett sent us linkage to one of the more bizarre one handed keyboards that I've seen in recent memory. It doesn't contain really anything technical (just a stupid rant about how people talk more during games (duh! I kept getting destroyed last night in tetrinet because I was busy screaming when I should have been dropping pieces) Update: 12/02 09:27 PM by CT : Ok, apparently it actually is 2 handed, it just looks weird and the buttons seem to be on one side.
The CTD Resource Network has a very fine examination on all kinds of keyboards, including several like the one you're looking for. These are all, as to be expected, quite pricey, but each has something to offer to everybody.
The Alternative Keyboard FAQ
I fully agree that too many 'ergonomic' keyboards still require typists to squeeze their shoulders together. I would really love a typing solution that let me place my hands wherever I please (like a motion-sensitive pair of gloves, or a pair of flexible mats), so I can reposition my arms however I like (on my lap, at my sides) and not lose any typing speed.